Jason Pillar

Hi all. I have just got a Nissan Juke and wanted to use my roof rack on it. Halford say all I need is a different fitting kit, which I have ordered. I am a little concerned that the fitting kit which tightens underneath the rim of the door is going to scratch the paintwork. Has anyone fitted a roof rack to their Juke? How did it go and do the fitting protect the paintwork or scratch it?